Answer: The time taken for the mass to reduce from 50 g to 41 g is 6 years
Step-by-step explanation:
Expression for rate law for first order kinetics is given by
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=22 years[/tex]
[tex]k=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{22}=0.0315years^{-1}[/tex]
b) for mass to reduce from 50 g to 41 g
[tex]t=\frac{2.303}{0.0315}\log\frac{50}{41}[/tex]
[tex]t=6years[/tex]
The time taken for the mass to reduce from 50 g to 41 g is 6 years
10. The length of the radius of a bicycle wheel is 14 inches. Which of the following is closest to the circumference of the wheel?
A. 44 in.
B. 615 in.
C. 88 in.
D. 154 in
Answer:
the answer is "a"
Step-by-step explanation:
Answer:
C. 88
Step-by-step explanation:
To find circumference you use the formula πd.
The diameter is 28, so 3.14x28.
This equals 87.92.
The closest one to 87.92 is 88.
This, the answer is C.88.
Hope this helped!!
what is (2m+7)+(4d+6)
Answer:
4d+2m+13
Step-by-step explanation:
NEED HELP!
Will be grateful
Answer:
p = -1/5
Step-by-step explanation:
-5p + -15/5 = -4
-5p -3 = -4
-5p = -4 +3
-5p = -1
p = -1/5
Answer:
p = [tex]\frac{1}{5}[/tex]
Step-by-step explanation:
Given
- 5 (p + [tex]\frac{3}{5}[/tex] ) = - 4 ← distribute parenthesis on left side by - 5
- 5p - 3 = - 4 ( add 3 to both sides )
- 5p = - 1 ( divide both sides by - 5 )
p = [tex]\frac{1}{5}[/tex]
i need the answers por favor
can anyone help for good luck
Answer:
Step-by-step explanation:
what is the distance between points (3,-5) and (-8,3) on the coordinate plane?
Answer:
1. 8
2. 11
for the first one its 8 and the second one is 11
7 t-shirts and a hat costs £67.00
5 t-shirts and a hat costs £49.00.
How much does a t-shirt cost?
How much does a hat cost?
pls help need it asap
20 points and a brainlist if you can explain
Answer:
£9.00
Step-by-step explanation:
67.00-49.00 = 18.00÷2 = 9.00
Let's Try:
a) 9.00×7 = 63.00+4.00(hat) = 67.00
b) 9.00×5 = 45.00+4.00(hat) = 49.00
Answer:
tshirt equals £9
and hat equals £4
Step-by-step explanation:
7t + h = 67
5t +h = 49 subtract bottom eq from top
2t = 18 t = 9
5(t) + h = 49
5(9) + h = 49
45 + h = 49
h = 4
solve square root of x+1 =4
Answer:
3
Step-by-step explanation:
4 - 1 = 3
whats the y-intercept
Answer:
2
Step-by-step explanation:
the y-intercept is where the line meets the y-axis
On a map of Volleytown, a scale of 1 centimeter = 50 kilometers is used. If the actual distance from Setter Street to Spike Street is 75 kilometers, how far apart should the two streets be on the map?
a
2 cm
b
1.5 cm
c
3,750 cm
d
1 cm
0.6y=1.8
Please help!
Answer:
Y= 3
Step-by-step explanation:
1.8/ 0.6=3
Answer:
y=3
Step-by-step explanation:
divide both sides by 0.6
0.6y/0.6 = 1.8/0.6
which sould equal y=3
What is 1.4x - (6.5x)
Answer: -5.1x
Step-by-step explanation: Distribute the negative to the 6.5x, and then subtract that from 1.4x. Your answer is -5.1x.
Answer:
I think it is -4.85 x Thst is just what I think
help please i will give brainlest
Answer:
perimeter of quadrant circle=1/4×pi×radius
""""" =1/4×3.14×10
perimeter of quadrant circle= 7.85cm
e
Answer:
[tex]5\pi[/tex]
Step-by-step explanation:
Circle perimeter: 2[tex]\pi[/tex]r
You get [tex]\frac{1}{4}[/tex] of circle perimeter
So: Circle perimeter = 2*[tex]\pi[/tex]*10=20[tex]\pi[/tex]
and: [tex]\frac{20\pi }{4}=5\pi[/tex]
Qual o valor de Pi ?
The Pi value is approximately equal to 3.14.
I hope I have helped a lot.
what is the perimeter of EFG?? NEED HELP ADAP
Answer:
78 cm
Perimeter = 12 x 3 + 9 x 3 + 15 = 36 + 27 + 15 = 78 cm
Hope that helps!
Answer:
Try 78
Step-by-step explanation:
EF is just AB times three. Assume you use the same scale factor for all side you get GE as 27 and GF as 36.
What is the perimeter of ABCD?
Perimeter=
Answer:
38
Step-by-step explanation:
The value of the computer decrease exceptionally throughout the five-year period. What was the average annual amount of decrease (in dollars per year) over the two-year interval from t= 2 to t= 4?
Answer:
Step-by-step explanation:
C grd. Gr
Jughead now earns $10.50 per hour. This is 175% of what he earned last year. How much did he earn last year?
Answer:
10.5/175*100=6
Step-by-step explanation:
What is the measurement, in degrees, of angle 1?
Answer:
180 - 55 = angle 1
80 - 55 = 25 so 180 - 55 = 125
angle 1 = 125 degrees
What is the area of the polygon given below?
Answer:
I dont see it
Step-by-step explanation:
Answer:
There needs to be a picture.
Step-by-step explanation:
203,245,237,233,90,100,100,277,265,264,265,285,288,291,
291,290,300,224,200,257,290,279,266,288 What is the mean?
Answer:
243
Step-by-step explanation:
im so happy
Write an Equivalent Expression for Each Expression.
1/4(2x-8)+5x
Answer:
11/2x-2
Step-by-step explanation:
1/4(2x-8)+5x
2/4x-8/4+5x
1/2x-2+5x
1/2x+5x-2
1/2x+10/2x-2
11/2x-2
TRUE OR FALSE (i really don't know what the right answer is i was hoping anyone else would know)
these number are balanced (numbers in photo)
A) true
B) false
I think it's A
Step-by-step explanation:
true
Find the term of the following arithmetic sequence. 15,22 , 29 , 36 ,
Answer:
The sequence can be continued by adding 7 to each number.
Step-by-step explanation:
15 + 7 = 22
22 + 7 = 29
29 + 7 = 36
36 + 7 =...... 43 would be your next number
What’s the answer to this??? need to know!?
Answer:
C/3
Step-by-step explanation:
What is the final price (before sales tax) for a set of golf clubs that cost $800 if they are on sale for 30% off?
A. $730
B. $770
C. $660
D. $560
Answer:
D. $560
Step-by-step explanation:
800 x .3 equals 240.
800 minus 240 gives you 560
Mark me as brainliest if this helps!
Give an example of a dependent event.
Answer:
Two events are dependent if the outcome of the first event affects the outcome of the second event, so that the probability is changed. Example : Suppose we have 5 blue marbles and 5 red marbles in a bag. We pull out one marble, which may be blue or red.
Step-by-step explanation:
Answer:
The dependent event about math is when the wind come, your plant dependent it's weight to let itself not get fly away.
Write the equation of the line in fully simplified slope-intercept form.
ਪੂ
11
NAUa006 5 5
1
-12-11-10-9-8-7-6-5-4-3-2-1,
1 2 3 4 5 6 7 8 9 10 11 12
-3
-4
-5
-6
-7
-8
-10
-12
Answer:
The slope of this line will be y=-3/4x+3
Step-by-step explanation:
Hope this Helped
Write a slope intercept equation for the following table can someone help
Answer:
y=2.5x+3
Step-by-step explanation:
(0,3) shows the y-intercept of +3
Use slope formula to find the slope:
8-5.5/2-1 = 2.5
therefore the M (slope) is 2.5
Answer:
y = 2.5x + 3
Step-by-step explanation:
y2 - y1/x2 - x1 = slope
5.5 - 3 = 2.5
2 - 1 = 1
2.5/1 = 2.5
8 = 2.5(2) +b
8 = 5 + b = 3
Help me what is it brain lit who gets right
Answer:
179.76
Step-by-step explanation: